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Vulnerability of TippingPoint IPS: bypassing via fragmentation

Synthesis of the vulnerability 

An attacker can fragment packets in order to bypass the IPS.
Vulnerable systems: TippingPoint IPS.
Severity of this threat: 2/4.
Creation date: 11/07/2007.
Références of this weakness: 3COM-07-002, BID-24861, CERTA-2007-AVI-298, CVE-2007-3711, VIGILANCE-VUL-6992.

Description of the vulnerability 

The IP protocol supports fragmentation in order to split big packets. The IPS reassembles these fragments to analyze the original content.

However, using a special fragmentation, IPS fails to reassemble fragments.

An attacker can therefore send packets specially fragmented in order to bypass the IPS.
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This cybersecurity weakness impacts software or systems such as TippingPoint IPS.

Our Vigil@nce team determined that the severity of this security vulnerability is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this vulnerability bulletin.

Solutions for this threat 

TippingPoint IPS: versions 2.2.5 and 2.5.2.
Versions 2.2.5 and 2.5.2 of TOS are corrected:
  http://tmc.tippingpoint.com/
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